MICROSCOPICAL OBSERVATIONS. 

 DITCH BY ROADSIDE, THIRTY MILES EAST OF TAMPA. 



At this locality I collected the following : 



Cosmarium pyramidatum, Breb. 

 Docidium minutum, Ralfs. 

 Euastrum sublobatum, Breb. 

 Micrasterias pinnatifida, Kg. 

 " truncata, Breb. 



Penium digitus, Breb. 

 Pterodina patina, Ehr. 

 Rotifer vulgaris, Schr. 

 Stentor polymorplia, Ehr. 



17 



" WARM spring" on THE ROAD TO TAMPA. 



This spring furnished the following species, viz : 



Closterium Ehrenbergii, Menegh. 



" turgidum, Ehr. 



Docidium nodulosum, Breb. 

 Cocconema cymbiforme, Ehr. 



Eunotia gibba, Ehr. 

 " librile, Ehr. 

 GalHonella aurichalcea, Ehr. 

 Himantidium arcus, Ehr. 



The surface of the spring was covered with a green mucous mass, composed 

 of Nostoc-like filaments, mingled with Mougeotia genuflexa, Ag., and Spirogyra 

 decimina. Kg. 



LITTLE HILLSBOROUGH RIVER, ON THE ROAD FROM PILATKA TO TAMPA. 



This river furnished the following, viz : 



Desmidib^. 

 Closterium Dianse, Ehr. 



" Ehrenbergii, Menegh. 



DlATOMACE^, &C. 



Cocconeis pediculus, Ehr. 

 Cocconema cymbiforme, Ehr. 

 *Peridinium carohnianum, B. 

 Pinnularia viridis, Ehr. 

 Synedra vitrea. Kg. 



WITHLACOOCHEE RIVER, ON THE ROAD TO TAMPA. 



March \st, 1850. — In this river I found, among the roots of Pistia stratiotes, 

 the following species, viz : 



DeSMIDIEjE. 



Closterium Dianas, Ehr. 



" Ehrenbergii, Menegh. 



- " setaceum, Ehr. 



Micrasterias americana, Ralfs. 



DlATOMACE^, &C. 



*Amphiprora ornata, B. PI. 2, figs. 15 and 23. 



3 



Cocconeis pediculus, Ehr. 

 Cocconema cymbiforme, Ehr. 

 Eunotia gibba, Ehr. 

 " librile, Ehr. 

 Fragillaria pectinalis, Ehr. 

 Himantidium arcus, Ehr. 

 Sm-u-ella splendida, Ehr. 

 Synedra vitrea, Kg. 



